Tool feed for lathes



Dec. 25, 1951 E, GQDFRlAUX 2,579,565

TOOL FEED FOR LATHES F-iled Aug. 4, 1945 i 8 Shee'cs--Sheei'l 2 MUNI' A Louis iodfrz'awc INVENTGR.

ATTORNEY 8 Sheets-Sheet 5 Louis E Godfrz'mzx IN V EN TOR ATTQRNEX L. E. GODFRIAUX TOOL FEED FOR LATHES Dec. 25, 1951 Filed Aug. 4, 1945- w I I WN Dec- 25 195l L. E. GoDFRIAux 2,579,566

TOOL FEED FOR LATHES Filed Aug. 4, 1945 6 sheets-sheet 4 ATTORNEY.

Dec. 25, 1951 E. GoDFRlAux TOOL FEED -F OR LATI-IES 6 Sheets-Shea?l 5 Filed Aug. 4, 1945 Louis E. God rz'azzz INI/EN 0R. fa@

ATTORNEY Dec. 25, 1951 L. E. GoDFRlAUx TOOL FEED FOR LATHES Filed Aug. 4, 1945 LoLzz'sE. Godfrmzx IN V EN TOR.

AT TORNEYI Patented Dec. 25, 1951 TOOL FEED FOR. LATHES Louis E. Godfriaux, Madison, Wis., assigner to Gisholt Machine Company, Madison, Wis., a corporation of Wisconsin Application August 4, 1945, Serial No. 608,985

This invention relates to a tool feed for lathes and has reference to a feed and traverse mechanism for the transverse cutting tool of an automatic lathe.

` The principal object of the invention is to provide a lathe having a servo-motor type of feed for the tool built into the lathe as the tool feed for `all ranges of operation.

Another object is to provide a simple and inflnitely variable tool feed for lathes without the use of expensive accessory equipment.

Another object is to provide a built-in control for the tool feed that will provide for contour duplication in an automatic lathe and at the same time be efficient for all types of operation of the lathe. Another object is to provide `a fluid pressure operated tool feed for lathes capable of feeding a cross slide or carriage or both in controlled cycles of traverse and feed movements with a single fiuid power unit.

Another object is to provide a simple and accurate feed for a lathe tool in multiple whereby it may be fed in either direction longitudinally of the work and across the Work to travel in any desired contour or path.

Another object is to provide a built-in servo motor type of tool feed for lathes with a iiuid power system capable of operating the tool under all conditions of traverse and feed movements required therefor.

Other objects of the invention are set forth in the description of embodiments of the invention illustrated in the accompanying drawings.V I

In the drawings:

Figure 1 is a front elevation of a turret lathe showing a tool post carriage having a cross slide thereon;

Fig. 2 is a transverse section of the lathe taken on line 2 2 of Fig. 1;

FigfS is anenlarged front elevation of a part of the lathe showing the turret and tool post carriages with parts broken away;

Fig. 4 is a transverse vertical section taken on line 4 4 of Fig. 3 and showing the construction for transmitting the carriage drive control;

Fig. 5 is a transverse vertical section taken on line 5--5 of Fig. 3 and showing the cam drum control for the servo-motors adapted t0 be operated by the movement of the turret carriage. r Fig. 6 is a longitudinal section showing the hydraulic power cylinder and follow-up valve 8 Claims. (Cl. 82-21) constituting the servo-motor drive for the carriage;

Fig. 7 is a transverse section showing the hy- `draulic power cylinder and follow-up valve constituting the servo-motor drive for the cross slide;

Fig. 8 is a front elevation of a, modified form of lathe employing a cam drum in the bed and which is driven directly from the head stock for controlling the servo-motor traverse and feed for the tool posts;

Fig. 9 is a left-hand end view of the lathe of Fig. 8 showing the head stock;

Fig. 10 is a right-hand end view of the lathe of Fig, 8 showing the servo-motor drives for the tool posts; and

Fig. 11 is a detail section showing one of the hydraulic power cylinders and follow-up valves constitutingthe servo-motor drive for one of thel tool posts for the lathe of Fig. 8.

The turret lathe of Figs. 1 to '7, inclusive, is similar to that set forth in applicants application, Serial No. 597,268, led June 2, 1945, now Patent No. 2,565,305, granted Aug. 21, 1951, for Automatic Turret Lathe, and comprises'a, bed I, a headstock 2 at one end of the bed, a tool post carriage 3 sliding longitudinally on the bed, and a turret carriage 4 also sliding longitudinally on the bed.

The bed I is supported on the floor or on a foundation by suitable legs I5, and a pan for coolant fluid and chips encircles the bed horizontally at a distance above the iioor.

The headstock 2, disposed at one end of the bed, contains the power drive and shift mechanism for the lathe spindle 6 which rotates in bearings in the headstock housing and is disposed longitudinally of the lathe. A motor 'I drives the headstock by means of belt 8. The motor I also drives a variable displacement pump 9 which provides thefluid pressure for operating the servo-motors, hereinafter referred to. I

The headstock 2 also drives the longitudinal traverse rod I0 for operating the turret carriage 4 in traverse. The feed rod II for operating the pump-motor unit I2 mounted on and feeding the turret carriage is driven by the spindle 6. The pump-motor unit is supplied with fluid under pressure from pump 9 by means of the telescopic tubes I3, the exhaust fiuid returning from the pump-motor unit I2 to a sump I4 in the base of the main `bed casting, `bv means of similar telescopic tubes I5. The pump 9 receives its supply of iiuid from sump I`4. The feed shaft II is rotated in correlation to and response to `the rota- .':l tion of spindle B. The fluid pressure drive and the control of the turret carriage traverse and feed are more specifically described in applicants co-pending application above referred to.

The tool post carriage 3 and slide I6 thereon generally operate through a relatively short path of reciprocation and it is possible to drive them by means of fluid power cylinders. For this purpose the longitudinal drive cylinder I1 for the carriage 3 is secured on the front of the bed I and has a piston I8 therein with a piston rod I9 extending through the forward end of the cylinder and secured to a bracket arm 28 on the carriage 3 by nuts 2 I adjustablyl threaded on the rod. Similarly a transverse power cylinder '22 secured on the carriage 3 and extending in the direction of movement of slide I6 has a piston 23 therein and a piston rod 24 extending through ythe forward end of the cylinder and secured at its outer -end toa bracket arm 25 on the slide I6.

`VrThe carriage drive cylinder 'I1 has its piston loperated by a servo-motor valve 25 preferably carried by the Cylinder and comprising a hollow- 4,cylindrical valve body providing a Valve chamber 21 which has three substantially equally spaced circumferential recesses 28, 29 and 39, and a v alve'plunger 3I having three flanges 32, 33 and `,35,110- provide a, closure for the recesses when the liangesf'register therewith. The diameter of the .inside of @hamper 2,1 and end flanges a2 and 34 are"considerably wider than the corresponding VKrecgsses 28 and 35 in a direction toward the corresponding ends 'of the cylinder I1 to support the plunger'in the cylinder.A Central flange 33 is of approximately the same width as the central regess 29. The plunger may be moved to dispose the'flanges toward either side of the corresponding'reces'ses 28,29 and 3U.

The walls of the cylinder are longitudinally grooved at between the end recesses 28 and 30 and' the corresponding ends of chamber 21 in order to avoid building up of end pressure between tmJ ends of plunger 3l and the ends of the valve `r`r Ihe're are ve ports leading to chamber 21 through the valve body 28'( The central, port 31 pensinto the central recess 29 and-supplies pressure fluid to chamber 21 through conduit 38 from plimpll. The left port 39 and right port 4U confleet lwith recess 28 and recess 30, respectively, anldser've to' drain the opposite ends of chamber 21 through conduit"4I to sump I4 lfrom which 'pump Si takes its inlet.

'--"A'port'42 in the wall of valve body 26 between recesses ZS'and 29 connects with the front en'd of power cylinder I1 through conduit'43. A similarfport 44 in thewall of valve body 26 between recesses 29`and 30 connectsgwith the rear or Vleft end ofpower cylinder I1 through conduit 45.

VThe plunger 3i is biased outwardly of chamber 21 (to the right in the chamber) by a` coil spring Mii disposed in the rear end of the chamber, and the-,position of the plunger is controlled by the y rod141. extending'therefrom axially through the Vfront end of the chamber 21 and valve body 26.

A. gear 48. rotatablymounted in bracket arm 2U meshes with the rack cna control rod 49 which abiitsthe outer end of rodl 41 and pushes the latter against the vbiasing force of spring 46.

Axialmovementof rod 41 relative to valve 25 ar 1jd. a.r rn 28 by rotation of gear 48 displaces the plunger 3I either to the right or left in valve rnber 21 thereby' uncovering recesses 28, 29

i and 30` and their 'corresponding' ports 39, 31'and flanges 32,V 33 and 34 is such as to fit closely j 4.8 which are normally closed by the corresponding anges 32, 33 and 34 of the plunger. Uncovering of the ports, as described, eiects the application of fluid pressure to a corresponding side of piston I8 in power cylinder I1 to move the carriage 3 in a direction tending to follow up Y they displacement of plunger 3l in chamber 21.

When the displacement of plunger "3 I' in chamber 21 is followed up by 'movement of arm 2|] on carriage 3 to compensate for the initial lengthenng or shortening of control rod 49 between the plunger and arm, flanges 32, 33 and 34 register with and cover the corresponding recesses 28, 29 and '38,' thereby stopping the flow of iiuid to and frompower cylinder I1 and stopping further movement of carriage 3.

The servo-motor action may be illustrated by assuming that gear 48 is rotated to push control rod 159 and plunger 3l to the left or inwardly of valve 2 6 and chamber 2,1. As a result of this movement, the displacement of the plunger una covers ports 3 9?, 31 and Mland provides `for :the passage ofv pressureiiuid from pump 9, through conduit 38 central port Y31, that part of chamber 21 confined between flanges 33 and 34, o ut port 44, through conduit 45 to the rear end of cylinder I1, thereby pushing piston I8 to the right and moving arm 2,5 and carriage 3 correspondingly tothe right. Fluid is discharged from `the right end of ylinder I1 through conduit 43, port 42, that part of chamberk 21 confinedbetween iianges 32 and 33, port 39, and conduit 4I to sump I4.v

"As piston I8 advances to `the right, pushing arm 2U, the latter carries control rodA ,49 tQ the right and thereby allows spring 4S to move plunger 3| back toward normal position whereports 39, 31 and 48 are closed'and no'further movement'occurs. s

The same servo-motor action, only in the reverse direction takes place when gear 48 is ro,- tated to allow plunger 3lv to move to the right in valve 26 under the influence of spring 46. In that instance pressure i'sadmitted to the right-hand or' forward end of cylinder I1 by passage from port 31 to port 42, and'fluid is discharged from the left-hand or rear end of cylinder I1 through port 44 to port 40 and thence to ysump I4.`

The slide drivecylinder 22 has its piston 23 similarly operated by a servo-motor valve V5I) mounted on bracket 25 on the slide. The valve 58 is constructed in the same manner as valve 25, previously described. However, since the valve is shown mounted on the member being moved (the slide) a detail description of itsconnections is given.

The valve 59Av has a substantially Vcylindrical valve chamber 5I in'which the plunger 5,2 reciprocates under the action rof spring 53'in the outer end of chamber 5I and of a rod 54 secured to the plunger and extendingr axially through the inner end of the chamber 5I and'valve bodyf50.

The walls of the chamber 5I contain the three spaced circumferential recesses 55, 55 yand V51 which are normally covered and closed by the corresponding flanges 58, 59l and 'on plunger 5.2. Longitudinal grofove's'l I between the recesses 55 and 51 and the adjacent ends of chamber 5I relieve fluid pressure in the ends of the chamber that would' otherwise oppose movement of the plunger 5,2.

The central recess 56 has a port 62connected by exible conduit53 or a suitable telescopic connection to tube I3' to supply power fluid from pump 9. Recesses 55 and 51' have ports 54 and T65, respectively, connected by conduit 66 to tube I5 to drain fluid to sump I4. Port 61 intermediate recesses 55 and 56 is connected by conduit 68 to the front end of `power -cylinder 22, and port 69 intermediate recesses 56 i.

and- 51 is connected by conduit 10 to the rear end of power cylinder 22.

The rod 54 extends inwardly of the carriage 3, and rack II meshing with a gear 12 rotatably mounted on the carriage pushes the rod against the biasing force of spring 53.

When gear 12 is rotated to move rack 1I outwardly relative to the carriage 3, the plunger 52 is moved against spring 53 to cause flanges 58, 59 and 60 to uncover their corresponding recesses 55, 56 and 51. As a result of this movement, powerfiuid is admitted from pump 9 through conduit I 3, conduit 63, port 62, that part of chamber 5| confined between fianges 59 and 60, port 69, and conduit 10 to the rear end of power cylinder 22 where it pushes piston 23 and rod 24 outwardly carrying with it the bracket 26, slide I6 and valve body 50 until the servo-motor valve has reached its normal closed position. At the same time fluid is drained from the front end of power cylinder 22 through conduit 68, port 61, that part of chamber 51 confined between flanges 58 and 59, port 64, conduit 66, and conduit I5 to sump I4.

When gear 12 is rotated to allow rack 1| and the plunger 52 to be moved inwardly in the opposite direction by spring 53, the follow-up action of the valve 56 is similar. In this case power fluid is admitted from pump 9 through conduit I3. conduit 63, port 62, that part of chamber 5| confined between flanges 56 and 59, port 61, and conduit 68 to the front end of power cylinder 22. Fluid is drained from the rear end of cylinder 22 through conduit 10, port 69, that part of chamber 5I confined between flanges 59 and.60, port 65, conduit 66, and conduit I5 to the sump. The servo-motor or follow-up action of the construction in this instance effects an inward movement of the slide I6 and of valve body `5I) until the normal closed position of the valve is reached.

If either or both of the plungers 3| and 52 are moved in either direction, either simultaneously or in timed sequence, at either a constant or varying rate, the tool post 13 with its tools 14 mounted on slide I6 can be made to travel in any desired path relative to the work which is chucked to spindle 6. Both traverse and feed movements may be provided for the slide I6 and carriage 3 by the same servo-motor construction.

The pump 9 is of a type which varies its displacement automatically with varying quantities of power fluid consumed to maintain a substantially constant working pressure in the system. When the carriage 3 and slide I6 are stationary and substantially no power fluid is being consumed, the pump 9 is reduced to its minimum displacement so as to avoid over-heating of the oil employed for power fluid. When power fluid is consumed the pump automatically steps up to a higher displacement capable of supplying `the quantity required.

The control of the follow-up valves may be `provided in several different ways.

In Figs. 1 to 1 the gears 48 and 12 are driven by means of cams and 16, respectively dis-` specifically set forth in applicants :so-pending application referred to above.

In this construction there are six sets of cams 15 and 16, each corresponding to the operations represented by a different face of the turret 19 on carriage 4. The different sets of cams are mounted on different faces of a drum 80 which is indexed in correlation tothe indexing of turret 19 to bring the desired set of cams 15 and 16 into operative position for each operative indexed position of the turret.

Various drive connections may be provided `between cam followers 11 and 18 and their corresponding control gears 48 and 12. A simple drive connection for follower 11 and gear 48 comprises a rack portion on follower 11 on carriage 4, raised Aand lowered with follower 11 in response to the height of cam 15 as carriage 4 moves along the cam, and which rack in turn drives a pivotal gear ofpiston I8, the shaft 84 moving axially of gear.

83 as permitted by its splined connection therewith. i

A simple drive connection for follower 18 and gear 12 comprises a rack 8| on follower 18 raised and lowered with the follower in response to the height of cam 16 as carriage 4 moves :along the cam, and which in turn drives a pivotal gear segment 81 which has its long arm 88-meshing with a gear 89 on shaft 90. The shaft 90 extends forwardly through carriage 3 where it carries a sprocket 9| splined thereto and which in turn drives a sprocket 92 on the shaft of gear 12 by means of the chain 93.

In the construction of Figs. 8 to 11, inclusive, the invention is shown as applied to an automatic lathe of a different type in which there is no tool post carriage or slide and in which two separate tools are fed toward the work from opposite sides thereof.

` The bed I is shorter than in the previous construction and carries a pair of upstanding lugs 94 at its right-hand end and which provide rear bearings for a pair of longitudinal relatively large diameter shafts 95 that are journaled at their forward ends in the headstock 2` on opposite sides of the spindle 6. l

Each shaft 95 carries a tool post 13 with a cutting tool 14 thereon, the tool post 'I3 being ad- Hjustable in position longitudinally of the shaft mounted at its lower end on a lateral bracket 91 on the side of bed I. The piston 98 of each cylinder is pivotally connected by the piston rod 99 to a lever arm |00 secured to the rear end-of the corresponding shaft 95.

The operation of each power cylinder 96 is effected by a separate follow-up valve IIJI secured on the rear end of bed I and having a construction similar to that of valves 26 and 58, The plunger |02 of valve I0| has its control rod |03 extending inwardly into abutting engagement with .a wedge member |94 pivotally depending from a vertically movable rack |05. VThe racle |85 7 is-held. for verticali reciprocation' in a block 1.05 on bed I and it meshes Awith gear teeth 'IM- ontlie -rea'r' end ofthe corresponding shaft 9.5. so .that .ro-

lextending.. longitudinally :through thel .center of bed I andwhic'h is. driven by a suitable gear train III vlieadstock. 2' from thevspindlei' so that the rotation of cams I8 and I9 is in -correlationto and; response to .the rotation. of thev spindle.

16am. IGR? is designed to control the infand' out movementof tool I4A on theY front side: of. the lathefby controlling the in and out movement of control: rod H13v for valve Ill]V on that side: of. .the 'la-the; Similarly, cam |09 is designed .to .control the viny and.Y outr movement of. tool Ill' .on the rear side `othe lathe .by controlling the in andi out .movement of control rod Ill3v for `valve IUI onthat side ofthe. lathe;

For this pur-pose .each cam. I 08 and .I t9 operates a-cam .follower II2 having a red H3 reciprocably .mounted inlog I I4 on therear end of hed' I. The

Vrod ll3is in alignment. withA the corresponding .control rod. I lland abuts the opposite Vside of the .corresponding wedge member IM- whieh disposed therebetween and which determines the space between the ends of the corresponding; .lQds |03 and H3.

operation.v wheneither cam Illa yor Hi8y in its. rotation iorees its corresponding lrod H13 out- 'Y/'ai'dly to vpllSh` its control rod. |633 in a manner movine plunger H32 outwardly of the Corresponding. valve lill, pressure Afluid `is admitted 'trom pump 9 through ronduit .I l 5... valvev it L. and oon- .duit-'I-lt .to` the lower endof the oone.spondin.e'v

power cylinder 96, therebyraising piston .98 and slowly rotating the corresponding` shaft 95 to'feed its tool 'Mtoward the work. At thesame time fluid dischargedA from the upper end of cylinder 96 through conduit I.I.Ivalve II, and conduitf H8 to sump Idirom whichy pump 9 receives` its .Sup-

plv oipower iluld.

The upward movement of. piston.` te in rotating i its corresponding shaft 95 effects a raisingoi the .rack ltwhion raises wedgememper. |04 and o1- lows. oontrolrod I03-to move linwardly under. the influence of its spring a distaneeeompensatine forY the outward movement previously eiiected. by the cam.

-Wnen rod. minas moved. inwardly suiiicieritly forplunger I'2 to reach its normal position-.where valve IUI is-closed, all further movement of piston 18.518,. stopped.

YAiemdual rise` in either camy |08 or m9' will .inthis way .eileot a gradual movement ofY the oorresponding tool inwardly of the workpiece. .Likewisega lowering` oi'either cam effects an out.- wardY movement of the corresponding tool away from. the. workpiece.

'Where either @am follower yH2 moves. inwardly by. Aa lowering of the cam, .its rod I I3 allows Wedge member |04. to move. inwardly under the. biasing iniiuenee of` .spring i519' on. plunger Il 12. This ooenevalve lol to. admit power fluid to the upper end' of'cylnder 98 and discharge fluid from the lower end. so as to effect. a corresponding loweringof the piston 98f and the desired outward movement of the tool 'I4'. Lowering of'piston 9.8 `effects a corresponding lowering ofrack. IIJ5 and its wedge member I4, thej latter thereby separat,- ine. rods.v L03 and H3' and pushiner plunger It? against its-Serine L19 untilthe plunger @loses the .valve ll. andstopsmo..minent ofpistone.

The invention, in V.its various embodiments. provides a simple hydraulicicontrol for thetraver'se and` feed. of a tool or tools in'a lathe.. which is Vbuilt into the lathe and'. which is adaptable .for all types of .operation of the lathe. The in.

.vention` is `applicable' .to various types of lathes.

Yas illustrated.

The toolzis fed by a follow-up wave or servomotorby whichr the rate `of ,feed is constantly .underecntrol and may .be variedas desired either by some external cam control or in correlation-to some movement .of another lathe part such' as theatnrret carriage, the' vspindle or thelike.

Where/a twofdirection or compound Yfeed provided for .a toolV it is; possible toV do contour tuiningvand .to produce any desired pattern of movement of .the tool relative to the'workfboth in -and .out and longitudinally of the work. The, .invention couples the'feed with otherbasio movements of the lathe suenos the spindle .speedor tur-retcarriage feed so that the tool can be fed .in correlation tol such basic Inovements.- The .cams employed may. however, modify the feed toproduce the desired feed or pattern omovement.

.cylinder disposed to operate a crank arm ensaid shaft to '.rockthe same and thereby feed the tool post to .and from' the work, a headstoclriordriving said spindle,. a vrotary cam driven by said headstcel;V in correlation vto the spindlespeed-Y,y a follow-.up valve having its plunger responsive'to said.. cam toy control the .operation .of saidvalve and thereby the operation of said power cylinder, and means responsivey to the .operation of said power cylinder and the movement ofv said tool post to modify the operation ofv .Said plunger by Said cam to effectthe movement-of the tool-post in correlation to the rotation of saidcam.- and its shape.

2. In an automatic lathe, a headstock having a rotary spindle adapted. tocarry a-workpiece, a plurality of tool posts each mounted. on- 4a separa-te rockshaft disposed around the spindle to pivot. toward and away from` the workpiecera separate power. cylinder for operating: each rock shaft by means` of a crank .arm on theoor-respondine shaft to rook the same and.l thereby feed theftool post to .and from the worha rotary sam member driven'loy said headstook inter-relationto the Spindle speed, Aa separate followupvalve. for controlling each of said power Cyl,- inders and having its plunger responsive to said membery andmeansresponsive totheoperationof the individual power` cylindersto modify the operation of the corresponding valve'plunger l.for each in a manner limiting the operationy of the power oylindeisfto movements corresponding to and determined by Said cam.

3. In an automatic lathe of theclass described having afhed.- a rotatable. vsfoneholdine, spindle, a tool support on saideloed and movable1longitodinally and; transversely of; saidA work-holding spindle,` at. least one-hydraulic motor and.: control; valvel therefor disposed to eti-eet'r movement oi- .said support in. one of vsaid* directions; said valve; easing; and plunger- .memloers with one. .of sameA freely supported by: theother iorfrelative axial. movement. camfmeansion said bed and operable in predetermined relation to the rotation of said spindle, a rack disposed to operate said freely supported Valve member, and a pinion disposed to traverse said rack in response to said cam, said supporting valve member and pinion being independently mounted for relative movement with one of the same being carried with said tool support whereby movement of the support effected by the rotation of said cam actuated pinion serves to further control said support by follow-up valve action.

4. In an automatic lathe of the class described having a bed, a work-holding spindle, a carriage mounted on and movable with respect to said bed, a cross slide mounted on said carriage and movable with respect thereto and a fluid motor and control valve therefor carried by said slide and carriage and disposed to move said slide relative to said carriage, said valve having casing and plunger members with one of the same freely supported by the other for relative axial movement, a remote control for said valve comprising a rotatable shaft carried by said bed and extending parallel to the direction of travel of said carriage, said shaft being rotated in predetermined relation to the automatic cycle of the lathe, a pinion gear rotatably mounted on said carriage and disposed to be rotated by said shaft irrespective of the position and motion of said carriage, and a control rack operatively connected to said freely supported valve member and engaging said pinion gear whereby relative movement of said slide and carriage is responsive in predetermined relation to the rotation of said shaft, said supporting vaive member and pinion being independently mounted for relative movement with one of the same being carried with said slide whereby movement of the slide effected by the rotation of said cam actuated pinion serves to further control the slide by follow-up valve action.

5. In an automatic lathe of the class described having a bed, a carriage mounted on and movable with respect to said bed, a fluid motor and control valve therefor carried by said bed and said carriage and disposed to move said carriage with respect thereto, a cross slide mounted on said carriage and movable with respect thereto, a second fluid motor disposed to move said slide with respect to said carriage, and a valve for said second motor disposed to control the /movement of the slide relative to said carriage, each of said valves having casing and plunger members with one of the same freely supported by the other for relative axial movement, a remote control for said control valves comprising rotatable shafts carried by said bed and extending parallel to the direction of travel of said carriage, said shafts being rotated in predetermined relation to the automatic cycle of the lathe, and control racks connected to operate the corresponding freely supported valve members and each disposed to move in predetermined response to the rotation of the corresponding shaft independently of the movement of the other, and said corresponding valve casing and plunger members being independently mounted for relative movement with the freely supported of said members carried with its corresponding carriage or slide whereby movement of the carriage or slide effected by the rotation of the corresponding shaft serves to further control such movement by follow-up valve action.

6. In an automatic lathe of the class described having a bed, a work-holding spindle, a carriage mounted on and movable with respect to said bed', a fluid motor and control valve therefor carried by said carriage and said bed disposed 1 to move said carriage with respect to saidV bed.

control valves comprising rotatable shafts carried by said bed and extending parallel to the direction of travel of said carriage, said shafts being rotated in predetermined relation to the automatic cycle of the lathe, a separate pinion gear journally mounted on said carriage and rotationally responsive to the rotation of each respective shaft irrespective of the position and motion of said carriage, and a separate control rack operatively connected to each respective freely supported valve member and engaging the corresponding pinion gear whereby movement of said slide and carriage is responsive in predetermined relation to the rotation of said shafts, and said corresponding supporting valve members and pinions being independently mounted for relative movement with one of the same being carried with its corresponding carriage or slide whereby movement of the carriage or slide effected by the rotation of the corresponding shaft serves to further control such movement by follow-up Valve action.

'7. In an automatic lathe of the class described having a bed, a work-holding spindle, a tool. support mounted on and movable with respect to said spindle, a fluid motor and control Valve therefor carried by said bed and disposed to move said tool support with respect thereto and to said spindle, said valve having casing and plunger members with one of the same freely supported by the other for relative axial movement, a remote control for said valve comprising a rotatable shaft carried by said bed and extending parallel to the direction of travel of said tool support, cam means on said bed to drive said shaft in predetermined relation to the rotation of said spindle, a pinion carried by said tool support rotationally responsive to the rotation of said shaft irrespective of the motion and position of said tool support, and a control rack connected to said freely supported valve member and engaging said pinion, said supporting valve member and pinion being independently mounted for relative movement with one of the same being carried with said tool support whereby movement of the support effected by the rotation of said cam actuated shaft and pinion serves to further control said support by follow-up valve action.

8. In an automatic lathe, a movable tool support, a iiuid motor disposed to effect movement of said support, a control valve for said motor, a nrst cam means operating in correlation to the automatic cycle of the lathe and connected to s aid valve to operate the same, and a second cam means operating in correlation to the movement of said support and interposed between said first cam means and said valve to modify the control of said motor by said first cam means and provide follow-up action for said valve.

LOUIS. E. GODFRIAUX.

(References on following page) REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Y Name Date Vickers Apr. 26, 1932 Vickers Oct. 18, 1932 Ferris Jan, 31, 1933 Burrell Nov. 21, 1933 Burrell Dec. 12, 1933 Number 1 2 Name Date Mennnger et a1. Apr. 7, 1936 Ferris JulyV 14, `1936 Anderson May 3, 1938 Godfraux July 14, 1942 Fritzsch J an. 12, 1943 May Jan. 4, 1944 Dodson Apr. 11, 1944 Turchan et al. May 15 1945 Johnson Nov. 6, 1945 

